I'm tempted to get rid of the coco fiber all together and just use soil. Cheaper, and all I'm doing with coco fiber is adding a bit to the soil to make it go father.I have two M. balfouri on coco fibre. While they are burrowed 90% of the time, the burrows really suck at holding structure and the Ts are constantly having to redo it. IMO coco fibre is a terrible substrate for terrestrial Ts that love to burrow, especially when dry (which is how you should be keeping M. balfouri). I've begun switching all my Ts to half potting soil (some local mix) and half coco-fibre, since I already have the stuff. The potting soil holds shape much better.